黑板天天被谁擦用英语怎么说用Who __ the biackboard___(clean) by every day 这样的句式
问题描述：
黑板天天被谁擦用英语怎么说
用Who __ the biackboard___(clean) by every day
这样的句式
答
Who is the blackboard cleaned by every day?
被动语态 be动词+动词过去分词